Plumb bob string holder



FIG. 1 is a top left side perspective view of a plumb bob string holder showing our new design;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken line showing the environmental structure of a plumb bob and string in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a plumb bob string holder, as shown and describ d. 